Improving measures for welding marks and streaks of PVC injection moulded parts (1)

To solve the problem of streaks and weld marks on PVC parts, first of all, the speed of melt injection into the cavity must be reduced to prevent the folding wave or spiral injection, or the occurrence of unstable filling phenomena such as melt shunt. However, sometimes due to the mold cavity being too wide, [...]

Skills for adjusting streaks and welding marks on thick PVC injection moulded parts (2)

Sometimes, the cavity space at the gate position is too large, which makes it difficult to eliminate weld marks and streaks. This requires an extremely low first-level injection speed for injection to reduce or eliminate the weld marks and streaks. But if the injection speed is too slow, the heat dissipation time of the melt [...]

Skills for adjusting streaks and welding marks on thick PVC injection moulded parts (1)

As mentioned in the previous column, to eliminate the streaks and weld marks of thick PVC parts, first of all, it must be ensured that when the melt is injected into the cavity from the gate, folding wave (snake type) or spiral injection cannot occur. The cavity must be filled smoothly and no shunts are [...]

Effective measures to solve the problem of streaks in thick injection moulding parts from the perspective of the mould

I have introduced a lot of thick PVC streaks adjusting techniques and improvement measures. However, if you can start with the mould and completely eliminate the root cause of this problem in the mould design-the cavity space at the gate position is too large, the streaks problem will not occur at all, and the same [...]

Analysis of the reason why the streaks and welding mark of thick PVC injection molded parts are difficult

In injection molding production, it is often encountered with thick PVC injection molded parts with a wall thickness of more than 50mm. Because the internal space of the cavity is too large, when the melt is injected from the gate into the wide cavity, the squeezed melt will be injected into the cavity from the [...]